"This paper describes the implementation of an attack on the Bluetooth
security mechanism. Specifically, we describe a passive attack, in
which an attacker can find the PIN used during the pairing process. We
then describe the cracking speed we can achieve through three
optimizations methods. Our fastest optimization employs an algebraic
representation of a central cryptographic primitive (SAFER+) used in
Bluetooth. Our results show that a 4-digit PIN can be cracked in less
than 0.3 sec on an old Pentium III 450MHz computer, and in 0.06 sec on
a Pentium IV 3Ghz HT computer."
http://www.eng.tau.ac.il/~yash/shaked-wool-mobisys05/index.html
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